/*.aa {*/
/*    background-image: url("../img/banner_qtah.jpg");*/
/*    height: 808px;*/
/*    !*    正常情况下，如果图片太小会重复*!*/
/*    background-size: 100% 100%;*/
/*}*/
.top {
    background-image: url("../img/banner_qtah.jpg");
    background-size: 100% 100%;
    height: 550px;
    /*width: 1920px;*/
    /*width: 1000px;*/
    /*height: calc(1000 * 808px / 1920);*/
    color: white;
}

.height-141 {
    height: 141px;
}

.top > div:nth-child(2) {
    background-color: rgb(230, 145, 55);
    height: 50px;
}

.nav {
    line-height: 50px;
}

.nav > div {
    padding: 0 30px;
}

/*鼠标放上去有样式变动*/
.nav > div:hover {
    background-color: white;
    color: rgb(230, 145, 55);
    cursor: pointer;
}

.ad > div:nth-child(1) {
    font-size: 40px;
    padding: 20px 0 10px 0;
}

.ad > div:nth-child(2) > div {
    font-size: 10px;
    line-height: 25px;
}

.ad > div:nth-child(3) > div {
    font-size: 30px;
    /*line-height: 40px;*/
    color: rgb(230, 145, 55);
    margin: 5px 0;
}

/*even 偶数  odd 奇数*/
.ad > div:nth-child(3) > div:nth-child(1) > div:nth-child(odd) {
    color: white;
    font-size: 20px;
}
